VMware vSAN 6.6.1 introduces the following new features and enhancements:

VMware Update Manager build recommendations for vSAN. Update Manager can scan the vSAN cluster and recommend host baselines that include updates, patches, and extensions. It manages recommended baselines, validates the support status from vSAN HCL, and downloads the correct ESXi ISO images from VMware.

vSAN requires Internet access to generate build recommendations. If your vSAN cluster uses a proxy to connect to the Internet, vSAN can generate recommendations for patch upgrades, but not for major upgrades.